Perhaps you should try some spelling variations:
"digitalia ebooks collection: lom edicion." » "digitalia ebook collection: lom edicion.", "digitalia book collecting: lom edicion.", "digitalia ebooks collection: lom ediciones.", "digitalia ebooks collection: la edicion.", "digitalia ebooks collection: con edicion."
"digitalia ebooks collection: con mediacion." » "digitalia ebook collection: con mediacion.", "digitalia book collecting: con mediacion.", "digitalia ebooks collection: co mediacion.", "digitalia ebooks collection: como mediacion.", "digitalia ebooks collection: con radiacion."

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("digitalia ebooks collection: lom edicion.") or ("digitalia ebooks collection: con mediacion."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("digitalia ebooks collection: lom edicion.") OR ("digitalia ebooks collection: con mediacion.")).
• Removing quotes may allow a broader search: (( digitalia ebooks collection: lom edicion. ) or ( digitalia ebooks collection: con mediacion. )).
• Adding a wildcard symbol may retrieve word variants: (("digitalia ebooks collection: lom edicion.") or ("digitalia ebooks collection: con mediacion."))*.